SSA Legislative Research Resources
Date:
Agency testimony from 1995 (104th Congress) to present (115th Congress): https://www.ssa.gov/legislation/congressionaltestimony.html
A summary of the current legislative developments: https://www.ssa.gov/legislation/115th.html
Regulatory actions (up to 2015): https://www.ssa.gov/regulations/recentregulatory.html